Here are the specs of what I use for my Black Rock wheels for the past 8 years.
Gorilla Small Diameter Black Tuner Lug Nuts Acorn Bulge Tapered Seat
Item# 21138BC
Thread Size = 12mm x 1.50 Thread Pitch
Black Chrome Plated Hardened Steel (matte finish)
Lug Nut Head Style = Small Diameter 6-Groove Tuner
Conical Seat Taper = 60°
Overall Length = 1.36” inches (35mm)
Outside Diameter = 0.80” inches (13/16”)(21mm)
Wrench Size Required = ¾” or 13/16”
1921SD Key fits 6-Spline Small Diameter Tuner Lug Nuts