The 300MM Combination Square Set is a versatile measuring and marking tool for establishing and checking 90° and 45° angles, measuring lengths to 300 mm and finding centres on round stock. It combines a 300 mm rule with a movable combination head, protractor and centre-finding attachment to offer layout, depth-gauging and simple levelling tasks in one compact kit. Its primary use is accurate marking and squaring in metalworking and woodworking workshops, site carpentry, plumbing and general engineering.

The 300 mm blade is manufactured from stainless steel (typically AISI 304), hardened and ground for wear resistance, with a satin/chrome-finished surface and deeply etched metric and imperial graduations to resist wear. The combination head is die-cast zinc with machined 90° and 45° bearing faces to ensure repeatable reference edges. A knurled locking screw secures the blade in position using a standard metric thread; spirit vial is incorporated into the head for quick level checks and the set includes a removable protractor and centre-finder attachment for added functionality. The product is produced to recognised DIN / ISO / BS measurement-tool tolerances for hand layout instruments, ensuring consistent accuracy for workshop use. (Drive type is not applicable to this passive inspection and marking tool.)

Typical applications include marking out and checking stock prior to cutting, setting up machinery and jigs, checking mitre and butt joints, transferring measurements and locating the centre of round components. The tool is used across industries such as joinery and cabinet-making, metal fabrication, mechanical engineering, plumbing and general maintenance where reliable, repeatable squaring and measurement are required.

Key benefits include corrosion resistance from the stainless blade and plated finish, durable machined faces for long-term accuracy, and multi-function capability (square, protractor, centre finder and spirit level) reducing the need to carry separate tools. The knurled locking screw provides quick positive clamping and the etched graduations remain readable even after extended use, making the set compatible with common workshop accessories and jigs.

Duchy Fasteners stocks the 300 mm Combination Square Set as single items for trade and DIY customers and offers complementary blades, replacement heads and larger sizes across our hand-tool range; please contact us for pack quantities and availability.