Bodycraft F711 Leg Extension + Curl AttachmentLocks so that it can be used as a Leg Hold Down Can be used for Ab Crunches Can be used as a Knee Hold Down in conjunction with High Pulley(s) Six Upholstered 4 x 8 rollers for Maximum Comfort. Weight peg accepts Standard 1 & Olympic 2 Weights (F550 Olympic adapter recommended) Can be added to the F704 and F602 Benches Can be added to the F705 and F601 Benches* (*F715 Leg Hold Down Attachment Kit required)