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Open Monday to Friday - 8.30am to 4.30pm, same day dispatch when you order before 2pm
Open Monday to Friday - 8.30am to 4.30pm, same day dispatch when you order before 2pm

INCRA T-Rule 12"

Original price £39.95
Current price £29.96

INCRA's T-Rule offers unparalleled accuracy, having patented marking holes to mark in rather than just etched graduations, these Rules allow you to mark out precisely with no risk of error.  It's very easy to draw exact lines in either direction.

Just select the slot or hole, insert a 0.5mm mechanical pencil, and mark the measurement with complete accuracy - unmatched in the industry of Marking Rules!

One of the fundamental errors woodworkers make when measuring out is marking a line then marking the next measurement line from the first; compound errors soon build up - these Rules leave those kind of mistakes as a thing of the past.


  • INCRA's Micro-fine patented guide holes and slots at every 1/16", 1/32", and 1/64", from 0 to 6 inches or 12 inches - it also offer 0 to 3" height markings on the end in 32nds.
  • Instantly locate your sharp pencil or scribe at the exact measurement with zero uncertainty and no eye strain! Our Professional T-Rules even offer marking holes every 1/100". This is unmatched in the industry.
  • The end reference bar can be easily removed or slid to to the left or right hand side of the rule allowing marking out tight into a corner of a cabinet or joint. It is also great for marking precise lines parallel up to 12" from an edge.
  • The T-Rule has an anodised aluminium fence keeping the ruler straight when marking out long lines.

Also available in 150mm, 300mm and 6" versions.

T-Rules are also available in INCRA Rule Sets.

    FREE UK Delivery on all orders over £30 within the UK Mainland, Northern Ireland, Highlands & Islands, for a limited time only*. Only £5.95 on orders under £30.

    Order before 2pm and we'll aim to despatch your order the same day, Monday to Friday. Please allow 1 to 2 working days for delivery.

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    Customer Reviews

    Based on 9 reviews
    Time Saving Accuracy

    When first looked at it seems like a fancy T-square - well it is, but when you use it and realize the various tasks it offers it becomes apparent how handy and time-saving this accurate measure is. Highly recommended; yes it's expensive but precision is never cheap.

    INCRA T-Rule 12"

    While I haven't used the INCRA T-Rule 12" yet, I believe that it will make marking out those pernickety imperial fractions a breeze.

    Incra rule

    This is a great ruler. It is accurate and makes marking simple but you need a mechanical pencil I believe 0.6mm.

    It is flimsy but that is so I can be used on curves. If you look after it will always default to a flat state.


    Purchased this after reading all the reviews...very disappointed. The metal is so thin I thought it would break on touch. Even though it’s very accurate it’s very flimsy....£45 delivered is not what I expected


    very good tool but very dear