Alu Front light holder / clip Outsider Of course, this high-quality lamp holder, from the Outsider series, can also be used for other frames and lamp models. Diameter inside: ~ 3.4 cm (~1,34 inches) Diameter outside : ~ 4,15 cm (~1,63 inches) Length: ~10,3 cm (~4,05 inches) Material: aluminum Color: black with Allen screw 1 piece included in delivery