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: 89 mm Openings (spacing): 100 mm Thread:M10. Weight:0.9 kg.