V-COIL - 4.4mm - STI-Drill Bit These drill bits have been manufactured by VÖLKEL and are part of the V-Coil brand, with 100 years of experience in manufacturing screw taps, VÖLKEL has become one of the worldwide leading suppliers for threading tools. Application: Core hole enlargement of the existing damaged or worn out thread  non abrasive material up to 900 N\/mm² unalloyed and low alloyed steel This is not a stock item therefore please allow 1-3 working days for dispatch. As this is not kept as a stock item, this is non-returnable & non-refundable. V-COIL - 4.4mm - STI-Drill Bit