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SKU: 7054-6
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The finest key cauls manufactured. Finely machined from solid brass, and guaranteed accurate to +/- 0,001". Caul sizes used primarily for balance rail are produced form 11/32" stock to allow insertion into all mortises. Those primarily for front rail are produced from 3/8" stock. Manufactured from solid brass so that heat can play a prominent role in the key bushing process. Simply lay your cauls on a warming tray before insertion. The heat from the cauls serves 2 purposes; 1) Heat will re-activate any hide glue that may have begun to set up too early; 2) Heat slightly irons the felt, reducing friction and truly sizing the felt to the caul. For professional results, choose the professional key cauls. (Set of 90)

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Pianos Bolduc, manufacturer of fine piano components, maker of specialized tools, and major piano re-builder distributes parts and supplies for piano technicians and rebuilders around the world. This catalogue has been specially designed to serve piano technicians, re-builders, and manufacturers. For technical advice, please do not hesitate to contact us by e-mail (