This kit is an essential item for mounting a non Rega cartridge on a Rega turntable with 3 point mount. With this kit you do not have to remove the entire arm to adjust VTA which is a huge plus! There are 2 versions, the SMALL spacer kit gives you 0.5mm to 3.5mm and the LARGE spacer kit gives you 0.5mm to 6.5mm.