The SS80 Builders Tool Set includes all the items you'll need to prepare the SS80 lower to accept Glock 43 parts. This includes the drilling fixture, rear rail system, extended trigger housing pin, locking block rail system, and drill bits. The SS80 Builders Tool Set is sold as a separate item and is needed to complete the SS80 80% Lower, found here. NOTE: Please watch the detailed instructional videos on the SS80 product page for more information regarding finishing your SS80. Also Note: For your convenience, the SS80 Builder's Tool Set now comes with a pre-drilled Locking Block. The product shown in the video is an earlier version that required additional drilling, however you can skip this step with current and future versions of the SS80 Locking Block.