Large shank mouthpiece with an identical rim and cup to the large shank 6.5AL, but with a slightly larger bore (0.276 vs. 0.261 inch). • 25.4mm diameter rim • Medium-deep cup • 0.276" throat • 429 backbore
Bore size comparisons: Bach 6.5A Small Shank = 0.2283" Bach 6.5AL Small Shank = 0.261" Bach 6.5AL Large Shank = 0.261" Bach 6.5A Large Shank = 0.276"