91 silverado 2500 brake question
 

hi, i have a 91 sliverado 2500 5.7 engine, i am changing the front brake pads but need to know what size allen key it takes for the caliper bolts to get the pads off. thank you. im asking so i can buy the right size before i get it all apart and find out i dont have the right size and put it all back together and drive to store again.