$56.99 1/2 Impact Wrench Socket Retainer Retaining Ring with O-Ring - 3 Sets | eBay
1/2 Inch Drive Pistol Impact Wrench Friction Ring Retainer | Universal Tool | UT
Proto Impact Socket Retaining Ring, 2-1/4 ID 2-1/4 Groove Diameter JRR07536 - Walmart.com 
