Safety Spotter Arm Attachments for 2x2 Power RacksSafety Catch Set for BD 7 and BD 33 Power Racks The MB F Safety Catch Set is designed to give the user the added insurance while lifting. Utilizing a straight, 11. 75 rubber protected reinforced beam, this distance and support is designed to catch or support those reps that just could not quite make it back to the original starting position. Features and Benefits: SECURE: Solid steel safety catches are welded to a 3 sided face plate for a secure grip