The utility model discloses a stability of is improved novel way awl, including empty cone, rings, fine rule and plummet, the fine rule is the N root, the length homogeneous phase of N root fine rule etc. A N rings are fixed on the inner wall of empty cone, the upper end of every fine rule is all fixed on rings, the lower extreme of every fine rule all with the top center fixed connection of plummet, and plummet axis and empty the cone dead in line. Effectively solve the potential safety hazard problem that the way awl easily fell down to the ground and brought. The plastic bottom blowing machine capable of removing outward bottom projection further has the following advantages: high safety, labor -saving performance, simple operation and high efficiency.