What size bolts does it come with?

Bolts type is M8, diameter is 8 mm, length is 35 mm.

I did not keep the box and cannot remember if it was USA or China. Try doing a search online. Sorry.

Can this be used with worm composting? I wanted to make sure the prongs are so sharp they'd cut up the worms.

I use this tiller to turn compost. The prongs are sharp and can get down to the bottom of my compost heap about a foot (0.3m). While I don't add worms I have seen them and other creapy crawlies in the compost and they get mixed up also.

How do you use this to aerate the lawn?

Hi Shelly&Greg, once you put it together, which is very easy to assemble, than you stand it where you want to aerate or till, and turn it, it's very easy to use!!

Manufacturer	Idea Garden
Item model number	BARAYSTUS-ST-YL-001
Product Dimensions	40 x 17.5 x 99 cm; 1.72 kg
ASIN	B096PJG4WK

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