Manufactured from high strength steel not aluminium since many cartridges manufacturers specifically advise against the use of aluminium Contains everything need to fit any phonos cartridges This selection of bolts , Nut and washers cater for a full ranges of cartridges body depths The Tool for head on the bolts allows for easy tightening with the supplied Hexagonal Please secure that the cartridges is Accurately fitting to the headshell making sure you for always use the shortest bolts that will accommodate your cartridges / headshell combination this 6 , 8 , 10 & 12mm bolts perfect for mounting the majority of cartridges in the market The 16 & 20mm bolts included for the deeping bodied cartridges and the 2mm bolts ( 10mm & 16mm ) included for the majority of headshells, Manufacturer: YUGSHNKFC