Specialty 10 degrees angled valve keepers. +.050" (1.27mm) installed height. Machined steel. Off-set raises the valve spring retainer to gain 0.050" installed height without machining the cylinder head spring seat. Fits standard keeper groove 5/16" stem valves. These are 10 degrees angled to fit specialty applications and Feuling High Load Beehive springs 566037 and 566039. Note: See 566043 for 10 degrees keys with standard installed valve spring installed height.