Switch kits usually consist of a single type of switch (such as tactile, pushbutton, slide, etc.), but may feature a combination of current and voltage ratings, circuit types, and mounting options. The kits come with different quantities of switches, and the available mounting styles include panel mount, through-hole, surface mount, R/A (right angle), and snap-in. Circuit variations range from assorted mixes to SPDT (Single Pole Double Throw), SPDT-NO (Single Pole Double Throw - Normally Open), and SPST-NO (Single Pole Single Throw - Normally Open).