This item will be shipped within One Week Return is not accepted for this item WSS20x24" Supported Shaft Rail 1 1/4" Shaft Rail and Length is 24" inch Made in Japan:NB Linear Systems Nippon Bearing Linear Systems NB Part Number Shaft diameter (Inch) Shaft Length L Inch Outer Assembly Dimensions (Inches) Base Mounting Holes (Inches) A W 1 W 2 N P WSS 20 x 24" 1-1/4" 24" 3.625" 4" 0.75" 3" 6"