Leofoto Outdoors Lever-Release Rapid Lock Ball Head w/ Hybrid Clamp Arca/Picatinny Black. The head has a lever release to lock/unlock the ball and a redesigned lever-release hybrid clamp system for both the ARCA and Picatinny rails with an adjustable clamping width. Specifications for Leofoto MA-40X Outdoors Lever-Release Rapid Lock Ball Head w/ Hybrid Clamp: Manufacturer: Leofoto Color: Black Attachment Type: Arca Features of Leofoto MA-40X Outdoors Lever-Release Rapid Lock Ball Head w/ Hybrid Clamp Aluminum CNC Machining Package Contents: Leofoto MA-40X Outdoors Lever-Release Rapid Lock Ball Head w/ Hybrid Clamp Leofoto MA-40X: MA-40X Outdoors Lever-Release Rapid Lock Ball Head w/ Hybrid Clamp Arca/Picatinny Black