The clamps are made of heat-treated high quality steel and nickel/chrome plated for superior durability.Improved features help you work quickly, safely and efficiently.-Reduced risk of adjustment rod popping.. -A large adjustment screw with a hole for easy screwing has been used.-The release lever has been vinyl-coated for comfort and ease of use.. The clamps are made of heat-treated high quality steel and nickel/chrome plated for superior durability.Improved features help you work quickly, safely and efficiently.-Reduced risk of adjustment rod popping.. -A large adjustment screw with a hole for easy screwing has been used.-The release lever has been vinyl-coated for comfort and ease of use.. Technical data: Throat depth: 76 mm Openings: Bore (spacing): 100 mm Thread:M8. Weight:0.5 kg.