Knob W640 SizeA: diameter W640 W640 item# sizeA price T-W640-015 5/8 inch $5.80 T-W640-018 11/16 inch $6.80 T-W640-020 3/4 inch $7.00 T-W640-022 7/8 inch $7.20 T-W640-025 1 inch $8.60 END