- SRAM Thin Flange T47 Bottom Bracket Socket Designed to create a tight grip on thin flange bottom bracket to avoid slipping while torquing cups into bike frames. - This single-sided socket is used for installing and removing 52mm, 16-notch bottom bracket cups. - The socket has a machined 3/8" drive, which can be used to allow 3/8" drive torque wrenches to be attached and locks onto a 1/2 inch UNC press rod for secure and easy installation of thin flanged bottom brackets. - Machined 6061 Aluminum Anodized Red