Replacement Carbide Inserts and Screws for use in iCARB Indexable Carbide Countersinks. Double the cutting life of your iCARB countersink once again with these double-sided and precision ground inserts proudly made in the USA. PLEASE NOTE: They are only compatible with Make it Snappy iCARB Indexable Carbide Countersinks. Countersink and Screw Driver NOT included.