Lowest height profile in its class These redesigned clamps feature a lever release for quick and easy attach/detach and have a width adjustment screw for non-standard arca and picatinny rails. Laser-engraved millimeter scale offers precise centering and positioning within the clamp jaw Leofoto LR-60 Lever Release Clamp, 60mm, 3/8" Screw Hole Leofoto LRC-60 - Lever-Release Hybrid Clamps Round, Arca The hybrid clamp design allows for both arca and picatinny rails to be attached. Hard anodized, aircraft grade aluminum for maximum strength and durability... Featuring a hybrid Arca and Picatinny lever release for easily attaching or detaching, it has a width adjustment screw for non-standard Arca and Picatinny rails... They come in both a round and square shape to match the head. All components are machined from solid aircraft aluminum and hard anodized for maximum durability and minimum weight Crafted from high-grade aircraft aluminum and featuring a durable hard-anodized finish, the Leofoto LH-LSC Ball Head Series for Shooting/Hunting is designed to meet the stringent demands of professional shooting and hunting.