These are genuine Keystone 1042 18650 battery holders. They are made of heat resistent nylon and have gold plated contacts. Probably the smallest battery holder on the market. I've looked and looked and these seem to be the best out there.
Keystone 1042 18650 Battery Holder
- Brand: Keystone
- Product Code: 93
- Availability: In Stock
- Ex Tax: £1.83