The AP-551 is precision machined to slide right into an Arca-Swiss style quick-release clamp. It also has 1/4" and 3/8" tapped holes for mounting to non-quick-release tripod heads and monopods. For Nikon 180-400 f/4E TC1.4 FL VR and 200-400 VR & VRII and 300 f/2.8 VR & VRII and 500 f/4 VR FL.