drywall chamfer tool

this is a chamfer tool for drywall. is a big hole so everything can come out so it doesn't clog. and it is very easy to change the blade on it and you can just turn the blade over too since it only uses one side of the blade at a time. you need 5 magnets that you glue on. the magnets are 8x2 and it makes a 2-3mm chamfer