Product Name: Total butterfly feather set Wooden easily and accurately. The feathers are flat that allows the drilling of straight and clean holes without slipping or deviation. It is used for daily work in carpentry, assembly, installation and manual business projects. Excellent and durable cutting power provides intensive use technical specifications: length 152 mm sizes ¼ (6,8,10,12,14,16,18,20,25,28,30,32) TAC451026 model number