... " x 1/2"25.4mm x 12.7mm16,17,18,19,20,211-1/2" x 1-1/2"38mm x 38mm14,15,16,17,18,191" x 2"25.4mm x ... 50.8mm14,15,162" x 2"50.8mm x 50 ... ,18,19,20,213/4" x 3/4"19mm x 19mm16,17,18,19,20,211" x 1"25.4mm x 25.4mm15,16,17,18,19 ... ,202" x 2 "50.8mm x 50.8mm15,16,17,18 ...