Vise Shaft Clamp Medium - For medium sized common axle and suspension componentsVise Shaft Clamp Medium Precision machined anodized aluminum clamps designed to allow for easy and secure clamping of round suspension components. Designed with strong magnet inserts to keep the shaft clamps securely in place when used with a vise clamp. Includes 1 pair of of shaft clamps to fit shaft diameters 17. 5mm 18. 7mm 19. 5mm 21mm 22. 2mm Other Shaft Clamps We Offer: Model ST0007: For common dropper seat post shaft diameters: 30. 9mm, 31.