ITEM NAME:50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack S5I7 50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack S5I7 18650 cylindrical battery holder, fire retardant ABS+PC 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. Please note, installation requires top and bottom piece to work. Model: 18650 Main Color: Black Size: 4 x 2cm/1.6 x 0.8 inch(L x W) Inner Dia: 1.8cm/0.7 inch Material: ABS+PC Net Weight: 105g Package Content: 50(+/-2%) x Battery Holder Brackets 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..18650 cylindrical battery holder, fire retardant ABS+PC materials;. Model: 18650.