SUNWAYFOTO FB-44II classic ball head is with a standard screw-knob clamp DDC-50L. The ballhead is CNC machined from light weight aircraft-grade aluminum, stain anodized surface finish for better abrasion and corrosion resistant. It is compatible with all Arca-Swiss style plates. All metal knob for smooth operation and long term durability Adopt one drop notch design, tilt over the camera from horizontal to vertical position easily Two sets spirit level mounting holes on 3 sides of the clamp Elliptical ball for progressive resistance and avoiding suddenly sliding down Safety stop relief grooves design to make sure the camera equipment is secure Specially designed panning base, smooth operation Improved ball, lighter MAC-14 SUNWAYFOTO MAC-14 Manfrotto/Arca compatible Clamp, CNC cutting machine from light weight aircraft-grade aluminum, stain anodized surface finish for better abrasion and corrosion resistant. Compatible with all Arca-Swiss style plates and Manfrotto 200PL-14. Perfectly fit Sunwayfoto FB-36, FB-44, XB-44, XB-52 ballhead and other various ballhead makers including: Area Swiss, Really right stuff, Wimberley, Jobu Design, Kirk Enterprises, Markins, Giottos, Benro, Feisol, Novoflex etc. Very versatile Jaw opening range of 37.25mm to 41.5mm will be compatible with any Arca style plate from various makers including: Arca Swiss, Really right stuff, Wimberley, Jobu Design, Kirk Enterpris