Description :Alloy with TPR QRAngle: 90° 160° Extension: 110mm Bar bore:ø25.4mm Quill Dia.:ø22.2/ø25.4mm Quill Length: 180mm [ Also available in aluminum quick release: MQ-553 ] Weight 632g :ø25.4mm x 180mm:MQ-553 642g :ø25.4mm x 180mm:MQ-553E Finish: Black/Silver/S.B. color : MQ-553E Packing: 25pcs/ctn/1.01cuft