Strong, lightweight aluminum sleeves provide a rock-solid fit between bottom metal and action to maximize accuracy from your hunting or target rifle. Far more stable than traditional stock-to-metal fitting methods, these sleeves work best with ACRAGLAS^® family of bedding epoxies. Exterior grooves maximize gripping area for bedding epoxy to guarantee that even the most frequent disassembly won’t loosen these sleeves. SPECS: Machined aluminum. 9?16' (14mm) diameter sleeve, .3' (7.5mm) diameter center hole (letter drill size N). Short sleeve 1' (2.5cm) nominal. Long sleeve 1Ѕ' (3.8cm) nominal. Cut to fit. Sold in pairs of Long, Short, or Combo of 1 each. Instructions included.