I used the 10mm
Fisch Brad Point Drill Bits (10mm x 133mm) - Premium Drill Bits for Soft, Hard, Veneered and Laminated Wood, MDF and Acrylic Glass - Beveled Edge for Fast, Easy Cutting - FSF-004097 - Made in Austria https://www.amazon.com/dp/B00CE94BDC/ref=cm_sw_r_cp_api_glt_fabc_80E51WWH8NFZS4H994JC?_encoding=UTF8&psc=1