Dremel 511E & 512E EZ Lock Coarse Grit and Medium Grit and fine Finishing Abrasive Buffs,

they do not last at all. I used them up ( all 4 of them ) in a matter of 10 minutes sanding black willow. I wont buy them again. you have to use extreme light pressure when using them, if you use heavy pressure they will burn up in a matter of 60 seconds, and they just dont sand well. At least not well enough for me.

Greg