The RRS 1/4-20 X 1.25 Mounting Screw is a custom-machined, stainless steel mounting screw designed specifically for Really Right Stuff's PC-LR and PC-PRO platforms. Rejecting conventional coin-slotted screws for their lack of torque, this screw adopts a hex-socket design, ensuring secure, reliable connections. Compatible with a 3/16 hex key (not included), it's made in the USA and embodies precision and durability. This captive-style screw is crucial for photographers seeking stable and secure camera setups. The 1/4-20 X 1.25 Mounting Screw is your essential accessory for enhancing photography equipment stability and performance.