[utility][product metafield][variant keys]oem-side

◇ Shift(5, R1): 1U, 1.75U, 2U, 2.25U, 2.75U
◇ Control/Alt(4 each, R1): 1U, 1.25U(2), 1.5U
◇ Win/Fn(2 each, R1): 1U, 1.25U
◇ Space(2, R1): 6.25U, 7U
◇ PgUp(3): 1U(R2, R3, R4)
◇ PgDn(4): 1U(R1, R2, R3, R4)