13PCS of Multi-Purpose Drill Bits 1/8" - 1/2" by 1/64" increments in metal box INCH SIZES

1) Product: 13pcs of Multi-Purpose Drill Bits 

            1/8" - 1/2" by 1/64" increments

  (1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16",11/32", 3/8", 13/32", 7/16",15/32",1/2")

2)Picture of 13pcs/set Multi-Purpose Drill Bits in inch size

3)Drilling Instruction

Please follow the speed and technique instructions below

Hardened Steel and Iron            2000—4000 RPM (Lubricant)

Masonry/Concrete                 2000—4000 RPM (Percussion)

Stainless Steel                    1500—2500 RPM (Coolant)

Glass/Tile/Granite                  300—600 RPM

Plastic and Laminates               300—600 RPM

Solid Surface Materials              300—600 RPM

Wood and Composite                500—1000 RPM