HYCHIKA® Instruction Manual BIM Hole Saw Kit ~ « 11PCS Bi-Metal Hole Saw Kit e PCS Mandrels e PCS Drill Bits 1PC Hex Wrench ® 1PC Package Box « Use Hole saws with care « Max cutting depths « Suitable for plaster&soft metal « Not suitable for cutting fiber cement sheeting » Do not over tighten grub screws + Remove debris from teeth for cutting efficiency WARNING FOR YOUR SAFETY EYE GOGGLES ARE RECOMMENDED TO BE WORN DURING USE.