No products can be returned or exchanged after 60 days / 15% restocking fee when returned within 60 days in original, / unopened condition only. / Please notify us if product is damaged at time of arrival.In this case, Neobiotech USA will pay return shipping charges, and replacement products.

Standard ground shipping 3~5 business days

It would not be worked if you tried other method (if inside thread is already damaged, screw can not be taken out)

Guide must be mounted before drilling or using claw drill. 

Reverse drilling with irrigation. 

More than 2000RPM is recommended.