The R1B1 and R1B2 cordless riveters are powered by rechargeable lithium ion batteries. The compact body and motor layout provide an ideal weight balance for reduced user fatigue. The riveters feature an LED spotlight and counter system to minimize error. The mandrel collector with increased holding capacity includes a safety device to prevent mandrels from shooting out. The riveters have a 22 millimeter stroke and can complete 560 rivets per charge. R1B1 is compatible with 2.4, 3.2, 4 and 4.8 millimeter rivets. The R1B2 is compatible with 4.8 and 6.4 millimeter rivets.