21/64 in Verified Special Size
The exact D105.083L identity is verified at 21/64 in diameter, 70 mm overall length and left hand rotation.


Royce Ayr D105.083L is a 21/64 in left-hand carbide-tipped brad-point dowel drill from the D105 family. Its verified 70 mm overall length supports precision blind-hole boring in compatible woodworking production systems.
Left Hand-hand brad-point dowel drill with a 21/64 in cutting diameter and 70 mm overall length in the Royce Ayr D105 family.
For compatible CNC drill banks, CNC boring systems, and portable woodworking machines configured for the appropriate D105 shank platform and left-hand rotation.
The Royce Ayr D105.083L is a left-hand carbide-tipped brad-point dowel drill engineered for blind-hole drilling in particleboard, MDF, and solid wood. Its 21/64 in cutting diameter supports repeatable dowel-hole production on compatible CNC drill banks and portable woodworking machines.
The exact product identity verifies 21/64 in diameter, 70 mm overall length, left-hand rotation and brad-point geometry. Royce Ayr identifies D105 as a carbide-tipped dowel-drill family using a 10 × 20 mm family platform. The current published standard table does not list this special size, so no unsupported cutting-edge, b1 or flute-count value is stated.
Carbide-tipped construction supports long service life in production boring. Before production, confirm left-hand rotation, toolholder compatibility, insertion depth, runout, drilling depth, and machine parameters for the material being bored.
Technical Specifications
The exact D105.083L identity is verified at 21/64 in diameter, 70 mm overall length and left hand rotation.
The D105 family is configured around its verified shank geometry and 70 mm overall length for compatible production boring systems.
D105 Industrial Carbide-Tipped / HW Family is paired with left-hand rotation in the verified D105.083L configuration.
Verify that the boring head, spindle, chuck, or adapter accepts the required shank and is intended for left-hand tooling. Confirm clean toolholding, minimal runout, correct insertion and height adjustment, appropriate drilling depth, secure workpiece support, and suitable spindle/feed parameters before production. Do not assume CE, b1 or Z values from adjacent standard sizes; those specifications are intentionally not assigned to this special SKU.
Royce Ayr D105.083L combines a verified 21/64 in cutting diameter, left-hand rotation, d105 industrial carbide-tipped / hw family, and 70 mm overall length in the D105 family.
It is intended for blind-hole drilling in particleboard, MDF, and solid wood on compatible CNC drill banks, CNC boring equipment, and portable woodworking machines.