I had another one of these explode this afternoon. Watch out if your using these. I wear big stick welding gloves and a face shield. Although the faceshield probably isn't going to stop much. It's made for sparks and bits of small bits of shite.
I had this injury about three years ago, caused by one of these wheels....on my right arm just above my glove cuff.
Also, I was working out at the farm cutting some notches in "C" purlin and had one of these explode and I felt it hit above my right knee and went completely through some almost new, baggy Carhartt heavy work pants. I was afraid to look in the hole left in the pants at my leg, but it didn't cut me any.
If you using these, be careful. And if you have kids or grandkid, be double careful.