... : OpeningWire DiameterIn inchIn metric unit(mm)1/4" x 1/4"6.4mm x 6.4mm22,23,243/8 ... 4mm x 12.7mm16,17,18,19,20,211-1/2" x 1-1/2"38mm x 38mm14,15,16,17,18,191 ... a one year warranty after Customer getting items. If the quality of our products shows problems, we will provide free spare ... our own factory,warehouse and machines,so we think our price will be very competitive,so please send us your inquiry ...