Portable Pinch (gripper attachment)The classic pinch attachment for hand grippers! Looking to convert some of your grippers into a mini pinch machine? These versatile and portable attachments are a great way to take your pinch training on the go or simply have around the house. The sleeve is 4" in length, with each pinch surface being 4" wide and 2" deep. These will fit all common metal handle grippers (up to 3 4" diameter). These come as a pair.