Drill bit Proline 71221, metal, Ø12 mm, length 210 mm, 1 pc

Drill bit Proline 71221 is a single straight-shank metal drilling tool with a 12 mm diameter and a total length of 210 mm. Intended for use in hand-held and bench drills, this bit is designed to create through-holes in metal and to support mounting, assembly and metal fabrication tasks that require a long-reach Ø12 mm hole. The product is supplied as one piece suitable for standard drill chucks and for use where a longer-than-average drill length is needed.

Advantages

The Proline 71221 drill bit provides an extended reach with its 210 mm overall length while maintaining a consistent 12 mm cutting diameter. Its straight shank fits common chucks and supports stable rotation in both portable and stationary drills. The single-piece design reduces wobble and improves concentricity for cleaner holes in metal. The geometry is suited for effective material removal when drilling through metal sheets, profiles and structural components.

Suitable for

• Drilling through-holes in metal sheets and plates
• Mounting and assembly tasks requiring Ø12 mm holes
• Metal fabrication and repair work with long-reach requirements
• Use in hand-held and bench drilling machines

Key specifications

• Material application: metal
• Cutting diameter: 12 mm
• Overall length: 210 mm
• Shank type: straight shank (suitable for standard chucks)
• Quantity in pack: 1 piece

How to use

Secure the drill bit in the drill chuck and tighten firmly to minimize runout. Select an appropriate drill speed and cutting fluid for the metal being drilled to reduce heat and extend tool life. Start drilling with light pressure to establish the pilot contact, then apply steady feed until the hole is completed. Withdraw the bit periodically for chip removal when drilling deep or through-thickness holes to prevent clogging and overheating.

Usage recommendations

For best results, use cutting fluid suitable for the specific metal (e.g., oil-based lubricant for steel). Match drill speed to material hardness — lower speeds for hard steels and higher speeds for softer non-ferrous metals. Clamp workpieces securely and wear appropriate eye and hand protection when drilling.