N20-24 Valve Lapping Blocks

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Used for lapping-in newly replaced or repaired valves.N20 Cornet/Trumpet, 5/8 (14.9mm)N21 Small Baritone, 11/16 (17.5mm)N22 Large Baritone, 3/4 (19mm)N23 Small Bass, 15/16 (23.8mm) N24 Large Bass, 1-1/16 (27mm) N25 Tuba 1 1/4 (31.75mm) - not included in set N26 Tuba 1 3/8 (35mm) - not included in set N20-24 Set of 5 blocks listed above Show more