What material are wheel spacers made of (steel, cast iron, light alloy, aluminum?)

I have a friend who works next to a place that can basically cut any shape from a machine using water under very high pressure. I was thinking of making a spacer (about a 1/4 inch think) but still using the existing threads. Would that put too much pressure on the threads?

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BlueFreedom
2003 Liberty • Freedom Edition • Atlantic Blue/Graphite trim
Command Trac, Trak-Lok, Rusty's 2.5" Coil Lift, Full Skids, Rocky Road Steprails, Moabs and General Grabber At2s
Alpine head unit, Alpine Amps (40 x 4 + 500 x 1) 4 polk db650s and two 10" Polk subs.

I wouldn't try it. Think about how much strain is on just 5 studs for each wheel. With a 1/4 inch less stud to thread a nut on, I think it could be real dangerous.

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2002 KJ 4X4, 3.7, 5 speed, offroad pkg, loaded, Moabs and Hankook A/Ts, Kenwood/ Alpine sound. Tommudd 3.5" econo lift and JBA A arms

Agreed. I run the Spidertrax spacers, and have had no problems, but they bolt on, and have new studs for the wheels to mount on.

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2005 Liberty Renegade Patriot Blue Pearl - 3.7L 4x4 - Offroad Package - Full Skids - Rock Lizard Skink Sliders - Frankenlifted - Spidertrax Wheel Spacers - Firestone Destination A/T's 265/75/16 - Sony Xplod w/ iPod setup - Trac Loc (coming soon)!!