Enhance your drilling precision and versatility with our drill collets. Made of copper, these collets offer durability and conductivity. Designed for secure clamping, they make drill bits remain firmly in place during operation. Features -Color:Multi -Material:Copper -Size:2.30X1.40X1.40cm/0.90X0.55X0.55in (chuck) -Size:5.50X2.00X0.10cm/2.16X0.79X0.04in (wrench) -Size:1.60X1.10X1.00cm/0.63X0.43X0.39in (nut) -Size:1.70X0.60X0.60cm/0.67X0.24X0.24in (collets) - Nut upper hole diameter: 3.9mm - Clamping range: 0.5-3.2mm - Copper core specification: 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.4mm, 3.2mm, 3.4mm - Secure and precision: With these precision collets, drill bit remains centered and stable during operation, reducing the risk of wobbling or damage to the work piece - Robust construction: Crafted from copper, these drill bit collets offer high strength and impact resistance, and they also boast good conductivity - Wide compatibility: Designed to fit a variety of drill chuck, widely compatible, can be used with drills of different sizes and types - Precision engineering: to provide accurate and stable clamping. This precision keeps drill bits held securely - Essential drill parts: From construction and woodworking to automotive and general maintenance Package list: 2 x nuts 1 x chuck 11 cores 2 x wrenches