INCRA T-RULE06 Precision T-Rule: Guide Fine Fractional Marks From One Edge

A ruler can show a measurement accurately while the pencil still lands beside it. Thick leads, viewing angle, and a ruler that shifts as the line begins all add small errors. The INCRA T-RULE06 Precision T-Rule takes a different approach: its stainless-steel blade contains guide holes and slots for a 0.5 mm pencil or fine scribe, while an adjustable T-bar registers from the workpiece edge. For small cabinet, box, and jig layouts, it turns repeated fractional marks into guided positions rather than repeated visual estimates.

Guide holes locate 1/16, 1/32, and 1/64-inch positions

The six-inch imperial blade provides marking guides at every 1/16, 1/32, and 1/64-inch scale position from 0 to 6 inches. Put a 0.5 mm mechanical-pencil point into the appropriate hole or slot, then move the rule or pencil as the layout requires. The point is physically captured at the selected increment instead of being placed against the side of a printed tick.

That is the strongest buying reason for the T-RULE06. It reduces parallax and lead-placement uncertainty when a project needs several fine offsets. The guides do not improve the accuracy of a dull, oversized, or damaged point. A 0.5 mm mechanical pencil is the documented fit; a thick carpenter's pencil cannot use these openings as intended.

The T-bar carries one edge reference across the workpiece

The red T-bar sits against the workpiece edge, turning the rule into a compact T-square. With that bar seated consistently, the blade can lay out perpendicular lines and carry the same edge-based measurement to multiple locations. Slide a pencil in a selected marking slot along the edge to produce a parallel line at a fixed offset.

This is a second, separate reason to choose the tool: the guide controls the pencil's offset while the T-bar controls the rule's relationship to the edge. Both references still depend on the workpiece. A chipped, rounded, or wavy edge will transfer its error into the layout, and dust under the bar can shift the zero. Prepare and inspect the reference edge before repeating marks on finished stock.

Vertical markings cover three inches in 1/32-inch steps

The end of the regular imperial T-Rule includes height markings from 0 to 3 inches in 1/32-inch increments. These can help locate a mark above an edge or transfer a short vertical dimension without changing to another square. The T-bar is adjustable, so its position can be set for the vertical measurement or the way the rule must register on a particular part.

Do not confuse this regular T-RULE06 with INCRA's Professional T-Rule. The professional model adds other scales, including 1/100-inch and metric references; those are not features of this six-inch regular imperial version. Likewise, the 12- and 18-inch T-Rules offer longer reach, but this model's horizontal scale ends at 6 inches.

Best for fine layout, not long spans or rough framing

The T-RULE06 is most useful on small parts where fractional offsets repeat: drawer components, hardware layouts, box joints, templates, and shop-made jigs. Its guided pencil positions and edge-registering bar can reduce the two setup errors that a plain ruler leaves to the eye.

It is not a cutting guide, a digital measuring tool, or a substitute for checking squareness. Protect the thin steel blade from kinks, keep the guide openings free of debris, and verify a critical setup on scrap before marking valuable material. Choose it when six inches of reach and imperial fractions match the work. For sheet goods, metric drawings, coarse construction, or dimensions beyond six inches, a longer or differently graduated layout tool is the better fit.