Base lock with 8 mm centre screw, lock - unlock operation, will fit into slot in rail of 12 mm, 14 mm or up to 18 mm with extra Bush.Including pressure bearing and discs underneath the handle for smooth operation and a lock nut.The hole diameter is 12 mm to accept most swivel clamps on the market.Total weight 450 grams. Made in Taiwan with 5 years guarantee.
