Diode - SMA / DO214-AC

Diodes come in all sizes and shapes, this one is a slightly larger version. It's the S1GFSCT-ND diode by ON Semiconductor.

Basic specs:
Current - Average Rectified (Io): 1A
Speed: Standard Recovery >500ns, > 200mA (Io)
Capacitance @ Vr, F: 12pF @ 4V, 1MHz
Mounting Type: Surface Mount
Package / Case: DO-214AC, SMA
Operating Temperature - Junction: -55°C ~ 150°C
Voltage - DC Reverse (Vr) (Max): 400 V
Reverse Recovery Time (trr): 1.8 µs
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Current - Reverse Leakage @ Vr: 1 µA @ 400 V

Take a look at the complete datasheet here: https://www.onsemi.com/pdf/datasheet/s1m-d.pdf

Sold in increments of 10. Quantity 1 means 10 diodes, 2 means 20 diodes, etc.