Comparison : Item # TNRB3 0UST-#5, Triangle Oversized Negative with Hole and Countersink, i.c. 0.400 / 0.410 in
Item # TNRB4-0UST-#5, Triangle Oversized Negative with Hole and Countersink, i.c. 0.525 / 0.535 in
Item # TNRB6 0UST-#10, Triangle Oversized Negative with Hole and Countersink, i.c. 0.780 / 0.790 in
Item # XTNRB4-0UST-#5, Triangle Oversized Negative with Hole and Countersinks, i.c. 0.535 / 0.545 in