Material: pc+pp+gp; Main Color: Black Size: 22 x 22mm/0.8 inch x 0.8 inch (L x W) Inner Dia: 18.3mm/0.7 inch Net Weight: 30g 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. Suitable for all types of battery assembly including do it option. Please note, installation requires top and bottom piece to work. Package Content: 40 x Battery Holder Brackets Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.