Dent Vision Shock Collar give you a shock Free option for your favorite knockdowns. It is expertly crafted to provide effortless knockdowns without straining your hands or fingers. This collar is set to maximum stiffness while allowing movement through the shaft. Measuring 3 inches in length, it accepts most 1/2 diameter knockdowns. ***Patent Pending*** 1 - Shock Collar - Black 2 - Urethane sleeves WILL FIT: VIP - 1.5, 2.0, 3.0, Simple WILL FIT with sleeve: Willey Quick - Rocket ship Dentcraft - 4" Aluminum, Delrin, LGKD or many 1/2 diameter knockdowns with minimum 3 inch shaft ***two sleeves included*** .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }