Superior quality Russian made RTM Kabestan steel QD base for sling swivel. This one is ultralightweight (10 g, 0,35 oz) and low profile. Made from high quality steel, can withstand any abuse. Adapted for use with and QD swivels, together with keymod hole allows swivel to sit very low. Base blocks any rotation of swivel inside of it. Size is 34x11x3 mm (1,3″x0,43″x0,1″).