shock absorbers - TOOGOO(R) Thread Rubber Vibration Isolator Mounts 1/4-20 (3/4" x 3/4") M6 20 x 20mm -4pcs Brand new and high quality. 3/4" in thickness (rubber height) and 3/4" in diameter. Two 1/2" long studs with 1/4-20 threads. Excellent noise and vibration reduction effect. M6 * 20 * 20 indicate threaded M6, rubber diameter 20mm, rubber height 20mm.