Features:
• The first impact-proof quick-action keyless chuck, with built-in spring-loaded bit clamping mechanism and dual dust protection
• Keyless for quick tool change
• Firmer grip of clamped tools even with toughest load
• A hard-wearing, oil-resistant rubber bellows system protects the thread and the precision press fit against dust and dirt
• For clockwise rotating drills only

Specifications:
• Clamping width : 1 - 13 mm 
• Female thread : 1/2"-20 UNF 
• Outside Ø : 42,8 mm 
• Length (closed) : 89 mm 
• Weight : 0,5 kg