Features: 1.Function: these keyless drill chucks can easily turn cordless power screwdriver into a drill or grinder to achieve fast switching tasks and maintain work progress; They are essential electrical tool accessories. 2.Wide range of applications: these drill chucks have various specifications and can be adapted to most drills and cordless power screwdriver; They can be applied in car garages warehouses offices homes etc. 3.Easy loading and unloading: this keyless drill chuck converter can go from driving to drilling in seconds and also gives you the freedom to drill with one hand great for working in tight spaces. 4.Size: (Approx) -- Clamping range: 1/4 inches -- 0.3 - 6.5 mm 1/4 inches -- 0.3 - 3.6 mm 1/8 inches -- 0.3 - 3.4 mm 1/16 inches -- 0.3 - 3.4 mm. 5.Material: Made of alloy rustproof and durable for use. Specifications: Material: alloy Color: Black Silver Size: (Approx) -- Clamping range 1/4 inches -- 0.3 - 6.5 mm/0.01-0.25inch 1/4 inches -- 0.3 - 3.6 mm/0.01-0.14inch 1/8 inches -- 0.3 - 3.4 mm/0.01-0.13inch 1/16 inches -- 0.3 - 3.4 mm/0.01-0.13inch Size: (Approx) 74x21x13mm/2.9x0.83x0.5inch 49x17mm/1.9x0.67inch Package Included: 1 PC x 0.3-6.5mm hexagon handle (black) 1 PC x 0.3-3.6mm hexagon handle (black) 1 PC x 0.3-3.4mm round handle 2.35mm 1 PC x 0.3-3.4mm round handle 3mm Note: 1. Due to the light and screen difference the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.