The 690 is a facing cutter designed to be used in conjunction with the HTR-1, HTR-1B, BFS-1, or BTS-1 to face head tubes and press fit bottom bracket shells. Faces the following bottom bracket standards: English threaded Italian threaded Faces the following headset standards: 1" external cup 1 1/8" external cup 1 1/4" external cup SHIS terminology: The 690 will face EC29, EC30, EC34 and EC37 frames. The 690-XL is a facing cutter designed to be used in conjunction with the HTR-1, HTR-1B, BFS-1, or BTS-1 to face head tubes and press fit bottom bracket shells. Faces the following bottom bracket standards: BB30 BB86/92 PF24 PF30 PF41 PF42 PF46 BBright™ Direct Fit BBright™ Press Fit 386EVO Faces the following headset standards: 1 1/8" internal cup 1.5" internal cup 1.5" external cup 1 1/8" integrated 1 1/4" integrated 1.5" integrated SHIS terminology: The 690-XL will face ZS41, ZS44, ZS49, EC44, EC49 and IS52 frames. The 690-XL will also face smaller bottom bracket and headset standards assuming there are no frame clearance issues The 690-XXL is a facing cutter designed to be used in conjunction with the HTR-1, HTR-1B, BFS-1, or BTS-1 to face head tubes and press fit bottom bracket shells. Faces the following headset standards: 1.5" internal cup SHIS terminology: The 690-XXL will face ZS56 and EC56 frames. The 690-XXL will also face smaller bottom bracket and headset standards assuming there are no frame clearance issues. NOTE: Always use cutting fluid such as Park Tool CF-2 when machining.