10pcs HSS Double Ended Rivet Drill Bit Set For Drilling Metal

Material : Cobalt Steel

Process : Fully Ground
Shank Type : Straight Shank

Helix Angle : Regular Spiral Type N

Surface Finish : Bright

Product Description

Material: Cobalt Steel
Precision ground from solid cobalt alloyed high speed steel
Higher cobalt alters the material characteristics by increasing the hardness and high resistance to abrasion
Suited to drilling materials that have high toughness and tensile strength, such as cast iron, bronze, weld seams and stainless steel
More suited to CNC machines, Pillar Drills and Drill Presses due to the brittleness of the material compared to standard HSS
Hold their rigidity and hardness at a higher temperature than HSS drill bits
Split points (self-centering points)

Spiral Flute Step Drills (Metric)
Size (mm)	Number of Steps	L1 (mm)	L2 (mm)	D1 (mm)	D2 (mm)
4-12	5	62	22	12	6
4-12	9	71	22	12	6
4-20	9	71	22	20	8
4-22	10	85	22	22	8
6-30	13	93	22	30	10
4-32	14	99	23	32	10
4-39	13	108	25	39	10
5-35	13	73	25	35	13
10-45	9	98	25	45	13
6-60	12	113	25	60	13

Spiral Flute Step Drills (Inch)
Size (inch)	Number of Steps	L1 (inch)	L2 (inch)	D1 (inch)	D2 (inch)
3/16-1/2	6	2 41/64	7/8	3/16-1/2	1/4
1/8-1/2	13	2 59/64	7/8	1/8-1/2	1/4
1/4-3/4	9	2 51/64	7/8	1/4-3/4	3/8
3/16-7/8	12	3	7/8	3/16-7/8	3/8
1/4-1 3/8	10	2 61/64	7/8	1/4-1 3/8	3/8