TIPS ----- Dear customer, if your plastic rivet gun gets stuck, don't worry! Simply gently pry the handles apart on both sides to easily release the mandrel. [➤Small tip: Before first use, it is recommended to lubricate the head of the rivet gun. rivet to reduce friction.] 40 REPLACEMENT NYLON RIVETS ----- Contains 4 nylon blind rivets of different sizes (diameter x mandrel height): 15.8 mm, 5 x 17.2 mm, 6.3 x 25.2 mm, 6.6 x 17.2 mm. Nylon is ideal for low friction and good resistance to Heat, UV, and chemical resistant. SLIM AND NON-SLIP DESIGN ----- Its thinner head than traditional riveters is ideal for hard-to-reach places. In addition, its handle is covered with a non-slip rubber sleeve for comfortable and safe use. DURABLE RIVET GUN ----- If your applications include repair and maintenance, roofing, automotive, HVAC, etc., this set is highly recommended. Complete and quick to use, this plastic rivet gun is an excellent choice. CONTENTS ----- 1 plastic rivet gun + 40 nylon blind