The Lezyne Cnc Alloy BB Tool 4612 (46MM) Hollowtech II is a durable workshop tool. The tool works with a socket wrench or 32 mm open-end wrench. Thanks to its serrated outline, the Lezyne Cnc Alloy BB Tool 4612 (46MM) Hollowtech II is a versatile bottom bracket tool. The tool is manufactured from premium aluminum with an anodized black finish.