subtraction sign meaning in Hindi

Examples

1. Pistol drilling , 6 - 8mm glass hole - maker , 6 - 8mm glue grain , level ruler or level pipe mainly for installation of suspended door , 68 expansion bolt , cross and subtraction sign screw driver etc
2. Tool that needs to be prepared during the installation : churn drilling , corner mill machine , welding machine , tapeline , plumb bob , glue pincers , iron chisel , 810 expansion bolt , cross and subtraction sign screw driver etc