fillister screwhead
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fillister head — noun or fillister screwhead : a slotted cylindrical screwhead with a convex or flat top * * * a cylindrical screw head. See illus. under screw … Useful english dictionary
fillister head — noun or fillister screwhead : a slotted cylindrical screwhead with a convex or flat top * * * a cylindrical screw head. See illus. under screw … Useful english dictionary