$69.99 Proto Impact Socket Retaining Ring, 2-1/4 ID 2-1/4 Groove Diameter JRR07536 - Walmart.com 
Astro clips 1/2 Socket Retaining clip & O-ring for impact wrenches, 5 Sets #12 | eBay
1/2 Impact Wrench Socket Retaining Ring Clip with O-Ring â Tool Guy Republic
