If you're hand-fitting and filing away metal to get components to fit together, particularly on some firearms where a fine attention to detail is desperately required, then the ORS NASCO Dykem Hi-Spot blue is a must-have in your workshop. This bright-blue paste can be evenly and consistently applied to any fitted surface, and when two parts are brought together, the blue rubs off on the high spots in the material, letting tinkerers and gunsmiths know exactly what parts of the gun need filing, fitting and polishing. Each bottle of Hi-Spot Blue contains 0.55 ounce of material.