Hi-Lux Optics Tube Locking Collar for Malcolm 6x Long Scope Matte Black. Installation of the Tube Locking Clamp by Hi-Lux Leatherwood fully prevents your Rifle Scope from inching forward to to recoil. Specifications for Hi-Lux Optics Tube Locking Collar: Manufacturer: Hi-Lux Optics Color: Black Finish: Matte Fabric/Material: Steel Quantity: 1 Features of Hi-Lux Optics Tube-Locking Clamp TLC Used to prevent the Malcolm Telescopic sights from moving due to recoil Package Contents: Hi-Lux Optics Tube Locking Collar Slotted Set Screws Hi-Lux Optics TLC: Tube Locking Collar for Malcolm 6x Long Scope Matte Black