MASKING MATERIAL

摘要

An object of this invention is to make easy automatic setting of a masking material to be fitted in a hole when protecting the hole from surface treatment. In this invention, for attaining the above object, a tapered guiding part is provided at the tip of a masking material insertion part so that, even when the masking material slightly deviates from the front side of the hole, said guiding part abuts on the peripheral edge of the hole for adjusting the masking material to lie in the correct position.