Fits chain sizes 415,420, 428, 520, 525, 530, 630 (check pin sizes below) pin is heat treated and hardened For chain 520 and up, it is recommended to grind the rivet head For riveting hollow nose master links Investment-cast, hardened body and redesigned body bolt Specification: to fit most chains ( 2mm 3mm 4mm ) May be bolted to a work bench, supported in a vise or held by handle Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Note: Plastic box style color is random, do not accept the specified Colour:Black Material:Metal Package Contents: 1 Set x Chain Breaker / Riveting Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.