I don't have the tools to measure the thermal resistance of these heatsinks to air, but if you look at them you can see that the fin area is large enough to transfer heat from the heatsink to air. The base is thick enough to disperse heat across the fins and help with transient heat in the object being cooled. Those are good sinks.
XPG GAMMIX S11 Pro 512GB M.2 SSD AGAMMIXS11P-512GT-C
43 Review
Cooler ID-Cooling SE-224-XT White (Intel LGA2066/2011/1200/1151/1150/1155/1156// AMD AM4)
26 Review
Netac NV7000 NT01NV7000-1T0-E4X SSD, M.2, 1.0Tb, PCI-E x4, Read: 7200 Mb/s, Write: 6800 Mb/s, 3D NAND, 1400TBW, NVMe
11 Review
Maximize Your Performance with Thermal Grizzly Kryonaut Grease
15 Review