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Two single-engine power tools
Riders on two custom fabricated machines compete in the "Funny Car" class at San Francisco's fifth annual Power Tool Drag Races. Races were held Sunday afternoon at the Ace International Speedway, better known as Ace Auto Dismantling, a junkyard where dilapidated cars, tractors and tires are piled high in an industrial no-man's-land at the southern edge of the city. The races allow only handheld power tools such as belt sanders, angle grinders, circular saws, drills, chainsaws, weed whackers and vibrators. Machines that are on rollers are barred from the event.