Comparison : Item # RNRB32.5-#4, Round Negative with Hole and Countersink, diameter 0.389 / 0.395 in
Item # RNRB33-#4, Round Negative with Hole and Countersink, diameter 0.389 / 0.395 in
Item # RNRB43-#8, Round Negative with Hole and Countersink, diameter 0.514 / 0.520 in
Item # RNSA106, Round Negative with Hole and Countersink, diameter 1.246 / 1.254 in
Item # RNSB108, Round Negative with Hole and Countersink, diameter 1.240 / 1.250 in