Yamaha
Clarinet,
Nickel Thumb Rest lock screw, 1 each.
Fits:
YCL-200AD(2)
YCL-200DR
YCL-200DT
YCL-255
YCL-255E
YCL-255S
YCL-355
YCL-400AD(2)
YCL-450N(3)
YCL-450NE(3)
YCL-450NM