For two 203mm calipers: (4) 20mm bolts for 203mm rotors and (2) brake pad screws/ pins.

Fitment:

20mm bolts are seen on most 203mm rotors that come OEM on most e-moto bikes.
20mm bolts are used for 220mm upgrade rotors with adapter brackets.
If spacers are used on your 220mm/250mm rotors, a longer bolt may be required. (30mm bolts) 

• Brake pad screw/ pin included 
• Anodized/ PVD coated to perfection
• Increased corrosion resistance
• Designed for calipers used on 203mm rotors 
• Made from certified Titanium Grade 5 6AL-4V
• Rolled threads for greater fatigue strength
• Greater strength to weight ratio than steel
• 40% lighter in weight compared to OEM
• Exclusively sold at Titanium Surron and authorized retailers only