The Body Solid GLDA3 Leg Developer Attachment is designed for use with the Body Solid GFID71 Heavy Duty Flat/Incline/Decline Bench and the Body Solid GFID100 FID Bench only. Use the leg developer for quad building leg extensions and work the glutes and hamstrings with leg curls. The 1" diameter weight post is will hold standard 1" weight plates. The Olympic Sleeve Adapter is available to accommodate your Olympic weights. For use with the Body Solid GFID71 Adjustable FID Bench and the Body Solid GFID100 FID Bench only.