... collar 2) PDC drillable 3) Thread: BTC/ LTC / STC 9- 5/8" casing float shoe & float collarA rounded profile component ... , since this material must be drilled out if the well is to be deepened beyond the casing point.Float collars ... : 13-3/8" float collar N80, 68 ppf, BTC 9-5/8" float collar N80, 47 ppf, BTC 7" ... float collar N80, 29 ppf, BTC 9 5/8" casing float shoe and float collar