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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 300mm


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 0.25mm, 0.5mm, 0.75mm or 1mm, from 0 to 150mm or 300mm. They also offer 0 to 50mm height marking slots on the end in millimeters.
      • INCRA'S Micro-fine patented guide holes and slots at the outer edges of the T-Rule's top and bottom are spaced every 1mm, whilst the four centre rows of holes are at 0.25mm increments.
      • You can draw a short line at any mm spacing using the outside slots
      • By selecting the centre rows and twisting your mechanical pencil you can spot mark any measurement to a full mm or 0.25mm, 0.5mm, 0.75mm or 1mm, before reaching the next full mm - this gives these rules the best accuracy you can achieve when marking out.
      • 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 300mm from an edge.
      • The T-Rule has an anodised aluminium fence keeping the ruler straight when marking out long lines

      Available in 150mm, 6" and 12" lengths.

        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 57 reviews

        I wished that I had purchased these rules long before now. I have arthritis in my hands and my hands also shake. So far these rules have helped me immensely,I can now have a lot more control over my measurements. Rules arrived on time and were suitably packaged.

        100% satisfied

        Fair price and fast delivery

        T Rules uk

        A fantastic piece of kit. A little expensive, but makes marking out easy use it all the time.

        Incra T rule 300mm

        Arrived very well packaged.This item was bought as a present for my wife for her crafting and Book Folding she said it was the best ruler for Book Folding that she had and is really happy with it

        Perfect product

        Arrived quickly and in good condition, many thanks!