High speed steel steel hart (bearing cutter) burs with 90° cutting angle. 3/32" shanks.
High Speed Steel (HSS) burs strike a balance between cost and durability. They maintain their hardness (temper) better than vanadium steel and cost less than carbide steel.
Hart (Bearing Cutter) Burs are used to cut seats in prongs, flush settings, & channels. They can also be used for bright cutting.
