Machine Inletted which is also referred to as Semi-Inletted or ninety five percent inletted, these items have been machine shaped and inletted and the necessary holes have been drilled. (there are specific stocks that may have a hole that is drilled during the fitting process and cannot be predrilled) These pieces are left slightly oversized to allow for the variances in the gun metal and will require final fitting to the action, trimming to the metal where the wood meets the action as well as final sanding, checkering if desired and application of desired finish. The two piece pump/auto pieces will take the least amount of skill to fit, boxlock over/unders and side by sides and centerfire bolt action rifles will require a higher skill level. Sidelock guns should be reserved for trained professionals. Suppliers such as Brownells will have all the necessary tools needed such as files, chisels, gouges, finishes, inletting pins, etc.