24pcs or 20pcs or 16pcs. 50% lighter than steel. Black surface finish resists to Galling and scratching from socket wrench. Black Lapped finish is the most durable and scratch resistant. 12×1.5 12×1.25 1/2-20. 60 degree rotating floating seat: select Aluminum or Titanium seat. You can contact me with an offer or with other colors or quantity sets. Delivers every package as promised on the listing or faster. The fastest and reliable.