HMH Custom-Drilled Coneheads. Get tube flies down deep with Coneheads specially drilled to fit on our plastic tubes. Large Coneheads fit Large 1/8" diameter Plastic cut-to-length tubes, Medium Coneheads fit Small 3/32" Plastic cut-to-length tubes, Small Coneheads fit 1/16" Micro Tubing. Available in nickel, brass, and black finishes. 10 to a package. Vendor: HMH Vise