NEW SET INCLUDES N54 SET AND N55 SET - ITEM # N545S This set of rods consists of five knuckle tools designed along the same principle as the N54 rods. They are 3/8" (9.5mm) in diameter with angles varying from straight to 90° for use with the larger instruments; trombone, baritone, euphonium, tuba and sousaphone crooks and bows as well as blending in the cornet and trumpet bells in the area between where the N57 dent balls stop and the tapered mandrel quits. These rods use the N80BS set of 5 dent balls giving the user a possibility of 25 different combinations. Get 3 N55E's for custom bending.N55S Knuckle Dent Rods, Set of 5 Save 15% off individual priceN55A Individual Knuckle Dent RodN55B Individual Knuckle Dent RodN55C Individual Knuckle Dent RodN55D Individual Knuckle Dent RodN55E Individual Knuckle Dent Rod Also Available:N54 Knuckle Dent Rods