RUIMI Titanium Step Drill Bit Spiral Metric Sizes 3Pcs;

5pcs HSS Spiral Grooved Step Drill Bit 4-12/4-20/4-32
Features :
No need for a pilot hole
Titanium coated to reduce friction and run cooler
Large bit has 3 sided shank.
Automatically deburr holes as you drill
High speed steel,durable.
Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy, insulation boards, PVC sheet,ect
Specification :
Color : Golden (as picture shown)
Material :High speed steel
Surface :Titanium Plated
Scop : thin iron plate,aluminum,insulation panels,PVC panels 4mm thickness within the timber.
1#"1/4 - 1-3/8" 10 Steps (1/4;3/8;1/2;5/8;3/4;7/8;1;1-1/8;1-1/4;1-3/8)
2#"3/16 - 7/8" 12 Steps (3/16;1/4;5/16;3/8;7/16;1/2;9/16;5/8;11/16;3/4;13/16;7/8)
3#"1/4 - 3/4" 9 Steps (1/4,5/16,3/8,7/16,1/2,9/16,5/8,11/16,3/4)
4#"1/8 - 1/2" 12 Steps (1/8;5/32;7/32;1/4;9/32;5/16;11/32;3/8;13/32;7/16;15/32;1/2)
5#"3/16 - 1/2" 6 Steps (3/16;1/4;5/16;3/8;7/16;1/2)
Package included :
1 x 1/4-1-3/8 Spiral Grooved Drill
1 x 3/16-7/8 Spiral Grooved Drill
1 x 1/4-3/4 Spiral Grooved Drill
1 x 1/8-1/2 Spiral Grooved Drill
1 x 3/16-1/2 Spiral Grooved Drill