Vector Optics Compact Multi Function QD Riser Mount Picatinny Rail Iron Material Level, Multi Function for Riser and Sling Attachment. Model: SCQD-01 Length: 40.5mm (1.6 inch) Weight (net): 63g (2.2 ounce) Fits on standard picatinny rail Quick release mount base High quality aluminum alloy in durable black matte finish, Iron material level It is a must for you to have for any tactical rifle Can be used as quick release optic riser use for a rail mount sling attachment mount to attach any harris style bi With hex key Designed for real fire caliber Qualified made for tactical purpose