1/4" Eccentric Spacer for Full Size V Wheels (Pack of 20) Used with V-Slot(TM) aluminum extrusion and V wheels to create linear motion systems 1/4" spacer allows up to 0.79mm of adjustment with a 10mm wrench Designed to sit in a 7.12mm hole and hold a 5mm axle/screw Material: 303 stainless steel Comes in a pack of 20 spacers