Note: We have 7 sizes of this shaft guide support brackets. To select the right one・ please follow our suggestions:<br /> * Number 1 is 8mm・ Number 2 is 10mm. Number 3 is 12mm. Number 4 is 16mm.<br /> * Number 5 is 20mm. Number 6 is 25mm. Number 7 is 30mm.<br /><br />Specification:<br /> * Model: SK8/SK10/SK12/SK16/SK20/SK25/SK30<br /> * Shaft ID: 8mm /10mm /12mm /16mm /20mm /25mm /30mm<br /> * Material: Steel<br /><br /> * Note: Please read the instruction to confirm it is the correct size the bearing you are looking for.<br /><br /> * Package Included: 1x Shaft Guide Support Brackets