Aluminum Tuning Forks (20-01) These satin finish non-tarnishing tuning forks are of one piece construction milled from heavy 3/8"x 1"tempered aluminum alloy with a 5/16"round stem turned to a 1-3/4"length. The tuning accuracy is within +1/20%. Aluminum Tuning Forks in both physical and concert pitch can be supplied mounted on a tuned resonator box. Set consists of resonator box, threaded stem fork, mounting hardware and 1"rubber mallet. Qty :