Special Designed Sockets for V4, VLV and Adverrun Contra drives. These are designed to use tighten the rear prop and front prop with the typical Allen driver you put your airplane together with. The hole is designed to accommodate up to 4mm drivers. Available in V4, VLV V1, V2/2/5 and WC, Adverrun versions.

note:change for red and black colors only due to material change.