The 3 hole – center tap base plate is made of anodized aluminum to withstand daily use and wear and tear. It mounts leveling feet and threaded stem casters, and is commonly used on a rectangular profile end to center mount the foot or caster. The 3 hole – center tap base plate can also be used on a profile side. It requires a tap to mount to a mating profile end. 15 Series Compatible Mounts leveling feet and threaded stem casters Attach to profile end or T-slot Made out of 6063-T6 aluminum with a black anodized finish ASIN B09RS2N6B1 Brand Name 80/20 Item Weight 8 Pounds Manufacturer 80/20 Inc. Material Type Aluminum Manufacturer Part Number 2130-BLACK-25