1.Cobalt drill bits are more expensive than other drill bits, but if you regularly drill through metal, they are a good investment since they tend to last longer.Amber Color (Bright, Black Oxide, Titanium, Black & Gold, Black & Bright are Available)

DIN1412C standard HSS P6M5 M2 fully ground Titanium coated step drill bit set for metal drilling
Hss Step Drill Bit, we have different material, HSSM35, M2, 4241. Straight flute and spiral flute, bright finish, Tin coated, amber finish. Hex shank and three flat shank, Drilling for Stainless steel, iron, steel, aluminum, wood, sheet iron & aluminum, plastic etc

MULTIPURPOSE MASONRY DRILL SIZE(mm): 4*80/5*90/6*100/8*120/10*120 BODY MATERIAL: #45 CARBON STEEL TIP MATERIAL: YG6X SURFACE: GROOVE PAINTING

Specification: 320MM Material: Aluminum alloy gun body, fully nickel-plated
Application: Used for caulking gaps in glass, plastic, ceramic tiles, marble, doors and windows, etc.

Specification: 320MM Material: Rubber-coated plastic handle; aluminum alloy gun body with full Teflon coating; adapter with adjustable valve
Application: Used for caulking gaps in glass, plastic, ceramic tiles, marble, doors and windows, etc.

Specification: 250MM Material: Material: Plastic handle, nickel-plated gun barrel
Application: Used for caulking gaps in glass, plastic, ceramic tiles, marble, doors and windows, etc.