TKW Fasteners Pvt Ltd. Manufactures Tubular Rivets/ Fasteners. TKW Fasteners Pvt Ltd. Is an ISO 9001: 2008 certified company. The Tubular Rivets/ Fasteners are set by deforming the hole formed in the mid or centre of the shank of the rivet. This can be done using a hand held punch or in high volume applications, fully automatically using a purpose built riveting machine. The correct specification of the rivet is the key to a successful application.