4 Hole Screw Adjust Trashwheel Stem. 
 
Key Features:
Yellow Dot Depth Indicators
2 Mounting Holes Per Side
Used with 12.75" Wheels
 
Specifications:
4 Hub Mounting Holes Locations
Bolt Hole Diameter - .66 in 
Square Tube Size - 1.5 in
Overall Height - 11.125 in