This combination of the Boss Adapter and the 50mm Clamp will fit virtually any Manfrotto ball head and produce a head that is Arca compatible. Own a Manfrotto 484, 486, 488, 494, 496, 498, 054, 055 and 057 series ball head and wish to use AS (Arca-Swiss) compatible system? The Haoge Female to Male Boss Adapter and 50mm Clamp allows you to more easily replace the clamp on your Manfrotto ball head. Features for 50mm Clamp: Arca Swiss compatible quick release clamp. Fast loading base with antiskid lock function. Aluminum alloy, CNC precision machining. Length: 88mm Width: 50mm Clamp with 39mm AS standard interface, compatible with all Acra-Swiss Style quick release plate such as RRS / ARCA-SWISS / KIRK / Wimberley / MARKINS / SUNWAYFOTO / Kangrinpoche / BENRO / SIRUI... Features for Boss Adapter: Ideal for Manfrotto ballhead. Adapter allows you to replace the original clamp. It keeps the quick release clamp from turning, and holds it solidly in place. The Boss Adapter has a ridge on one side which fits in the groove on the underside of the quick release clamp, and a ridge on the other side which fits in the groove on the Manfrotto ball head. Installation Steps: First, remove the platform from the ball head by unscrewing the single M6 that secures it to the ball stem. Once the platform was off, aligned the clamp and boss adapter with the bosses, dropped in the M6 screw and tightened it. Package included: 1 x Haoge CP-51 50mm Quick Release Clamp 1 x Boss Adapter 1 x Hex Key 1 x Mounting Screw (Please note: The Manfrotto Ballhead is not included and is showing for illustration only.)