uxcell 50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack 18650 cylindrical battery holder, fire retardant pc+pp+gp materials; Crack resistant edge with the slot, with the firm, It can accomodate various size; Battery installation hole diameter 18mm, 2-linked structure, Nickel plate vibration test can be conducted without attachment to any device. Inner Dia: 1.8cm/0.7"; Package Content: 50(+/-2%) Pcs x Battery Holder Brackets; Model: 18650; Main Color: Black; Size: 4 x 2cm/1.6" x 0.8"(L*W)