Neewer Stainless Steel D Shaft D-ring 1/4" Mounting Screw 0.39"/10mm Shaft for Camera Tripod Monopod or Quick Release (QR) Plate -10 Pack Can be used with tripods, monopods, telescopes, ball heads, lens collars, lens plates etc. 1/4" Stainless steel (metal) Tripod screws. 1/4" metal male thread with flat head screwdriver slot. Shaft is 10mm in length, approx 5mm threaded, 5mm unthreaded. 10x Neewer 1/4" Screw(with ring)