Special drills of finest-grained hard metal, specially suitable for jewellery-grade steel, platinum and titanium. These twist drills have two cutting edges and two flutes and and have a substantially longer service life than traditional tool-steel or HSS twist drills in the above stated jewelry materials.

Twist drill Fig. 4203S “HM”
Material: Finest grain carbide
Execution: 2 grooves
Range of app.: steel, platinum, titanium, hard metal alloys, gold, silver
Shank: 2,35 mm dia.
Rec. speed: 5.000 - 9.000 r.p.m. (freehand drilling)
Rec. speed: 8.000 - 14.000 r.p.m. (upright drilling)
Advantage: durable