Features Excellent Aluminum Alloy Material: This rail auxiliary clamp is made of excellent aluminum alloy material with high hardness, high wear resistance and durability. Sliding Mortise Design: This rail assist clamp features a sliding mortise design that adjusts the height up and down and locks securely so it won't wobble from side to side. Adjustable Height: This rail assist clip is height adjustable, you can adjust it according to your needs, which is very convenient. Securely Clamp Board: With a maximum distance of approximately 58mm, this clamp can securely hold your board in place during track adjustments. Wide Application: This rail adjustable auxiliary clamp has a wide range of applications and can be used for woodworking, experimenting, handicrafts and so on. Specification: Item Type: Adjustable Track Lifter Clamp Material: Aluminum Alloy Maximum Adjustable Height: Approx. 115mm / 4.52in Maximum Distance Of Clamp Board: Approx. 58mm / 2.283in Package List:2 x Adjustable Track Lifter Clamp 1 x Connecting Rail Nut Package List 2 x Adjustable Track Lifter Clamp 1 x Connecting Rail Nut