uxcell 49 Pcs 18650 Lithium Cell Battery 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 18.3mm, 1-linked structure, Nickel plate vibration test can be conducted without attachment to any device. Inner Dia: 18.3mm/0.7"; Main Color: Black; Size: 22 x 22mm/0.8" x 0.8"(L*W); Package Content: 49 x Battery Holder Brackets; Model: 18650