Evolution Gun Works Number 8 Drill Out Kit .313 Cal. This kit has everything you need to convert your rail for #8 screwsThis kit is only for drilling out your EGW Scope Mount to #8 screws not your receiver. Specifications for Evolution Gun Works Number 8 Drill Out Kit: Manufacturer: Evolution Gun Works Color: Silver Features of Evolution Gun Works Number 8 Drill Out Kit 1-Drill Bit (11/64) 1-Torx Driver 5-#8 Screws (.313 OAL) Package Contents: Evolution Gun Works Number 8 Drill Out Kit Evolution Gun Works 49994: Number 8 Drill Out Kit .313 Cal