A321 21 Piece HSS Steam & Tempered 3mm 13mm 0.5mm Drill Set

The Dormer A321 is a 21-piece HSS drill bit set covering 3mm to 13mm in 0.5mm increments, designed for professional and workshop drilling applications. Each drill bit features a three-flat shank that prevents slipping in the chuck, making them ideal for use in both hand-held power tools and pillar drill machines. Manufactured from high-speed steel with a steam and bronze tempered surface finish, these jobber length drill bits deliver reliable performance across a wide range of materials including steel, stainless steel, aluminium, brass, and plastics. The 135° split point ensures clean, accurate hole starts and reliable penetration, whilst the optimised helix design provides efficient chip removal and a smooth finish. Supplied in a practical plastic storage case, this set is particularly suited for general engineering workshops, metal fabrication, automotive maintenance, and construction applications. The flatted shank design make these drill bits especially effective in pillar drill machines where consistent accuracy is essential, whilst also providing excellent grip security when used in hand-held power tools.

Features and Benefits:

• Three-flat shank design prevents drill bit slipping in the chuck
• Steam and bronze tempered finish reduces friction and extends tool life
• 135° split point for clean, accurate hole starts
• Complete 21-piece set covering 3mm to 13mm in 0.5mm increments
• Supplied in plastic storage cassette for organised workshop storage
• Suitable for multi-material drilling including steel, aluminium, brass, and plastics
• Jobber length provides ideal balance between strength and reach

Specifications: Material: High-Speed Steel (HSS) Point Angle: 135° split point Shank Type: Three-flat shank Surface Finish: Steam and bronze tempered Drill Length: Jobber length Set Range: 3.0mm to 13.0mm Increment: 0.5mm Number of Pieces: 21 Storage: Plastic case