We love the Tormach TTS Set Screw holders!

They are our go-to choice for TTS holders (ER collets can be great, but we find the set-screw holders to be more rigid).  The factory set screw is prone to stripping out – luckily this is a quick fix!

• Replace the small set screw (includes 1/4″ holders) holders with a 1/4×28 set screw.  We use McMaster-Carr P/n 94105A630
• Replace the large set screw holders (includes 3/8″ and 1/2″ holders) with a 3/8×24 set screw.  We use McMaster-Carr P/N 94105A617

P.S. the set screw holder racks are Tormach P/N 35521 – see all of our Tormach What to Buy Recommendations Here