Step drill bit made of industrial high-speed steel have durability and high-speed punch. Titanium coating improves drill bit and reduces the heat generated by friction to cut metal sheets.Step drill bits for metal compatible with 10 Sizes: 1/4 inch , 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1-1/8 inch, 1- 1/4 inch, 1-3/8 inch. Meet your different needs, greatly the of choosing different step drill bit.The 118 split-point tip design of drill bit increases the cutting speed while preventing off-center line when drilling. 3 Flat design for increased safety and stability, drill bit can be better fixed to the to prevent falling off and slipping during the rotation.Step drill bit grooves a smoother cut that removes burr chips, dust and chips for faster chip evacuation, while helping to prevent chips from , allowing for smoother drilling without heating.Drill a small (about 1/8 inch) pilot hole using drill bit, it can drill up to 0.2 inch thickness of stainless steel and iron, plastic, wood, fiberglass and other sheet metal.: High speed steel + stainless steelcolour: goldPackage Contents:2 x step bits for metalOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.