Toledo Engineers Square 150mm KT853521M without disassembling the machine The auto sense grip without disassembling the machine TengTools hip grip design on the ring end for contact with the flat side of the fastening SSA6 ENGINEERING SQUARE NON GRADUATED 150MMUsed for producing right angles in carpentry and engineering applicationsInternal & External Squareness as per BS 939 Grade BAn excellent range of precision steel squares that are second to noneHardened spring steel blades are permanently fixed to the stock by means of tapered self locking rivets which ensure complete rigidityBoth the blade and stock are precisely ground to ensure straightness and parallelismWorking edges of the blades are lapped which further enhances accuracyA groove on the inner corner of the stock aids in the clearance of burr or dirtType: Non graduatedBlade length: 150mm