Description of π© HSS6542 Spiral Stainless Steel Cutting Atoplee Drill Bit
{Good Quality Metarial} Made of HSS 4242,high hardness,strength and longevity. {Design}Shank Type:Triangle shank; Type:Spiral groove. {Size}Shank diameter: 10mm(0.39'') for 4-32; 8mm(0.31'') for 4-20; 6mm(1/4'') for 4-12;Hole Cutter step included: 4-12/20/32mm. {Usage}Used with pistol drill or bench drill, water it to cool while working to prolong its life, the proper drilling speed is 250-400 rpm.Suitable for these work-pieces that hardness is lower than 28 degree and the thickness is beyond 5mm, such as aluminum parts, insulation board, PVC plate, etc. {Package Included}3pcs HSS 6542 Spiral groove STEP DRILL.