Ramset 100 Pack .27 Caliber Red Strip Fastener Load. Ramset powder loads provide the performance and power you need to penetrate hollow block and concrete. The loads are color coded red and are at power level 5. When beginning projects use lower level loads and move into higher load if fastener does not set completely. The .27 caliber red fastener load is to be used with Ramset SA270, Cobra, Viper and Hilti models DX-350, DX-351, DX-36M and DX-451.