Ensure correct angle is maintained on bevel edge chisels and plane irons when used with a diamond whetstone. Precision roller with alloy body which self-centre clamps bevel edge chisels from 3/8 inch (10mm) to 1-1/4 (32 mm) and plane irons up to 2-3/8 inch (60.3mm) wide. Maximum tool thickness of 7 mm. The setting device is preset for 25 degree, 30 degree, 35 degree and 40 degree angles. Positive location for roller and blade. Adjustable stop for setting blade angle. Use with 63 mm (2 1/2 inch) wide x 178 mm (7 inches) long bench stones or workshop stones. Not for use with Firmer chisels or short blade (Butt) chisels 1 x Diamond honing guide 1 x Diamond honing guide setting device