Description: 1.Fully heat treated shank and body for durability. The anti kickback design ensures safe installation. Bottom cleaning router bit is with high hardness, long life and resulting in nice finishing on woody pieces after cutting. 2.The shank has uneven contact marks or grooves when clamping. It means that there is skidding and the clamp cover hole changes. Should promptly replace the clamp cover so as to avoid accidents. 3.Be sure to use the right size clamp cover to avoid vibration or broken shank to make the bit fly off. Always keep the router bits clean, and need to add machine oil to prevent rusting. Never change the form of the bit.