Ridgid 64642 AR-99 Roller Stand 36- Inch Pipe w/Steel Wheels Other Tools They are made of brass

They are made of brass

6140 chrome vanadium steel (up to 1-1/4-Inch or 32mm sizes)

Also it has a special knob for easier tightening of the feedscrew

brass and cold forged aluminum Made from high grade tungsten carbide for increased life and performance High strength brazed joints minimizes vibration and eliminates breakage

This wheel is a replacement for catalog numbers 31632

Ridgid 64642 AR-99 Roller Stand 36- Inch Pipe w/Steel Wheels Other Tools They are made of brassFeed screw quickly adjusts sizes and keeps pipe centered on stand. RIDGID's Adjustable Stand with Steel Rollers is ideal for use with threading machines, roll grooving or other pipe working applications. Rollers can be locked to prohibit rotation. Feed screw quickly adjusts sizes and keeps pipe centered on stand. Ideal for use with threading machines, roll grooving or other pipe working applications.