Socket Block
From Feed The Beast Wiki
The Socket Block is a useful block that allows you to utilize 3 items: Item Shifter, Lacerator, & Robotic Arm. All Socket Tools must be attached to the Socket Block and all Socket Blocks must be attached to an inventory. If the Socket Block is mounted to a Servo, the Servo counts as an inventory. Socket Tools also react to redstone control. If attached to a Servo, the Socket Signal can be used to control the Socket Tools instead.